Malicious PDF — malware analysis report

Static analysis result for SHA-256 349b2f80c44f9b2a…

MALICIOUS

PDF

107.5 KB Created: 2021-09-03 22:38:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 24f8ea7692c37be155b081b0173d4627 SHA-1: f736b01e5c1acd9dfff3c44ddc4a6bfbda284abe SHA-256: 349b2f80c44f9b2aa99f68875736698898946de1b76281f66f8f02ddc216aa45
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many of which point to websites hosted on compromised CMS uploads, suggesting a link farm designed to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a malicious intent to redirect users to potentially harmful sites. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://energooptima.hu/upload/File/14624638641.pdf In PDF document text
    • http://planet-for-events.de/userfiles/file/motazukekesako.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/fapemamebag.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/e7f3bda89ed507bfd98861c1af117334/14255685654.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/ririvinubomarezetag.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/28474457997.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/mpdi6ngm3r8so28m91eqv7okh3/fexapijikikisopi.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4d114da49---95452876671.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e21d43e2a---5397618852.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/7d38cd2961d8d68aa50d679a5502af28/doguda.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/lalapipifi.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/fefuxopomixubiwej.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5a19b5d69---14884446278.pdfIn PDF document text
    • http://asfus.net/virgsurv/userfiles/file/51747095494.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/musepifelekosofizupawiwa.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612199c3b02f6---jotusotetovevo.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-6-18/20210618002217211308.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/fisam.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/f70215216929928f63d44f62f477b657/74028511716.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/85fd2e38543d10de4d9c857c2ac33bff/bosokezitorajegiv.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/64t14mvd0dga5moa3t5ppbo7dc/guvolaturagubakabunobebu.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/vedozaxiril.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/lixixumube.pdfIn PDF document text
    • http://holzbau-napetschnig.at/xafesetaxususo.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e11fe7f7e---wawebinatika.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=avicenna%27s+medicine+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000132b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014ac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AC5 23808 bytes
SHA-256: bc4481b0965407bbe313bf1c48523c9cb35f556cb97c99cda98eba4a3378000e
font_02_sfnt_off00018872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18872 10496 bytes
SHA-256: 854232ff696a1f00945b41161e2f2fa6befffd2936955e576cd30eb514a7baa4

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